Pole structure.



No. 7|2,394. Patented Oct. 28,A ISIIIZ` F. H. LINCOLN.

PULE STRUCTURE. (Application med .my a. 1902.

(No Model.)

T Yside of country roads.

rNITED STATES PATENT OFFICE.

FREDERICK H; LINCOLN, OF PHILADELPHIA, PENNSYLVANIA.

POLE STRUCTURE.

f`Iii-"(DIlf'l.CA'IION forming part `en? Letters Patent No. 712,394, dated October 28, 1902.

Application filed Tiily 8,1902.

'Io struction of metallic poles-suchas trolleysuspension poles, electric-light poles, telephone and telegraph po'le's,.and awning,hitching, and lamp posts, which lare usually erected near the curb of city streets and along the Such poles, as Ais well lknown, are attacked by rust most rapidly at that portion or those portions adjacent the :ground-level, and where they are placed in -proyimity to t-he line of `an electric railway fz@ lor lother circuit carrying heavy currents the :same portion lis exposed to themost vigorous :action of electrolysis. rIt is this portion of the fpole also which is subjected to `the greatest `lateral strain. e l i The objects of the invention are, first, to :produce appele in which the stock or supxporting portion is effectually protected from moisture and other matter contained in contiguous earth and from electrolysis at the portions where such protection is most needed and desirable; second, to produce a pole in which that portion adjacent the ground-level A is strengthened `and reinforced. j

Other objects will more fully appearas I proceed with the description of the invention.

In attaining these objects I combine with a pole-stock a sleeve so secured thereon as to hermetically inclose those portions of the stock adjacent the proposed ground-level, this sleeve preserving the pole-stock intact, besides strengthening it in the part to be slibjected to the greatest strain.

My invention is illustrated in the accompanying drawings, wherein like letters of reference indicate correspondingparts throughout the various figures, and in which- Figure 1 is a side View, partly in elevation and partly in section, showing `one form-of my improved pole. Fig. 2 is a transverse section of the same, taken on the line X X 0E Fig. l.

ing a modification, part of the sleeve being Fig. 3 is a viewin elevation show- Serial No. 114,779. (No model.)

broken away; and Fig. 4 is a similar View showing a second modication.

Referring to the drawings, and rst more particularly to Fig. 1 thereof, A is the lower portion of a pole or post stock, which may be of any preferred form, in this instance shown as a hollow cylinder. The sleeve B, having an internal diameter slightly less than the external diameter of the stock, is shrunk upon the stock to hermetically inclose those portions thereof adjacent the proposed` groundlevel. (Indicatedin Fig. 1 by the dotted line I I.) This is edected by heating theisleeve it on the stock tothe desired place, which may be smoothed or machined when desir.- able or necessary to receive it. the sleeve forms with the stock at'O (3T a hermetic closure, so that without the addition of packing, dac., the portions of the stock inclosed are effectually protected from moisture and injury both immediately-above and below the surface of the ground when the the pole is set. Furthermore, the sleeve forms an integral part of the pole and strengthens it both by its added thickness and by pressure upon the stock, which prevents distortion of the latter. Y,

In Fig. 3 I have shown a. pole structure in which the sleeve portion has a greater internal diameter than the exteranal diameter of with internal lianges b of the proper internal diameter to make the necessary close contact with the stock-surface to form a hermetic closure. Pressure is thus exerted upon the stock only at the points at which moisture `would otherwise gain access to the protected portions, and a greater diameter is given to this part of the pole, by which its purchasesurface upon the ground is increased. In Fig. 4 a similar construction is shown, with the addition of a plurality-fof internal flanges Z2 inwhen the sleeve is in position exerting pres- Vsure upon the pole stock, thereby both strengthening the stock and bracing the sleeve against the pressure of the ground. The number of these intermediate flanges isoptional and may be varied to meet diiferent conditions--such as the thickness ot the sleeve, height of the pole, &c.

until sufficiently expanded and then slipping i When cool,

the stock and is provided at its extremities termediate the anges b, each otthese iianges IOC , Although I have shown and described a cylindrical pole, I do not wish to limit the scope of the invention to that particular form, as other forms Well known or hereafter to be devised may be employed Without departing from the principles above set forth. Many other changes also may be made in the details of construction without departing from the spirit of the invention, and these, I wish it to be understood, fall strictly Within the scope thereof.

Having described my invention, what I claim, and desire to secure by Letters Patent of the United States, is-

1. In apolestructure,l the combination with a stock designed to be set with a portion thereof below and a portion above the ground-level, of a sleeve shrunk upon and hermetically inclosing those portions of said stock adjacent the proposed ground-level, substantially as described.

2. In a pole structure., the combination With a cylindrical stock designed to be set with a portion thereof below and a portion above the ground-level, of a sleeve shrunk upon and hermetically inclosing those portions of said stock adjacent the proposed ground level, substantially as described.

3. In a pole structure, the combination With ahollow stock designed to be set with a portion thereof below and a portion above the ground-level, of a sleeve yshrunk upon and hermetically inclosing those portions of said stock adjacent the proposed ground-level, substantially as described.

35 4. In a pole structure, the combination With\ a stock, of a sleeve having a greater internal diameter than the external diameter of said stock and provided with an internal iiange at each extremity,said sleeve being shrunk upon and together With said iianges hermetically inclosing those portions of said stock adjacent the proposed ground-level, substantially as described.

5. In apole structure, the combination with a stock, of a sleeve having a greater internal diameter than the external diameter of said stock and provided with a plurality of internaliianges, said sleeve being shrunk upon said stock to force said lflanges into intimate contact therewith and hermetically inclose those portions of said stock adjacent the proposed ground-level, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing Witnesses.

FREDERICK H. LINCOLN. Witnesses:

FRANK B. ELLIS, ARTHUR H. BURNS. 

